feat(swift-ios): show workspace images inline

[saphid]

What Changed

• render supported workspace images directly inside native SwiftUI Markdown messages
• resolve image paths through the workspace-safe file-link pipeline supplied by fix(swift-ios): open workspace file links #5803 and preview navigation supplied by feat(swift-ios): add file preview navigation and info #6132
• resolve nested Markdown image paths relative to the containing file
• preserve bounded loading, failure, accessibility, and tap-to-preview states

This PR remains image-only. Workspace videos continue to render as fallback text, and there are no server, wire, web, desktop, or React Native changes.

Dependency

Chain order: #5803 → #6132 → #6133.

The exact published parent of this PR is #6132 head b19aab5339f851323b706ad7360fb810d35fd034. Review only the final image commit until both dependencies land.

Failure repair

The prior #6133 head failed five HomeThreadMetadataTests provider-catalog assertions inherited from its stale pre-Theo chain. #6132 was independently refreshed against Theo, then repaired for current Macroscope findings at b19aab533; this PR is rebuilt directly on that exact parent. The approved inline-workspace-image behavior was not changed to repair the original unrelated failures.

Verification

Current head: 83272ae26ec674dff4da64d573d81aec41708173
Theo target: f98cab553546558e28d6e22f3dbe9807ecc3325f

• affected native tests after review fixes: 48 passed, 0 failed, 0 skipped on a fresh task-owned iPhone 17 Pro / iOS 26.5 Simulator
• full native gate after review fixes: 343 passed, 0 failed, 1 skipped
• generated Swift wire fixtures: matched
• exact-head Debug app: built, installed, and launched successfully in Simulator
• exact-head interaction: transcript exposed Open image Generated image; Generated video remained text; tapping the image opened workspace-file-preview with Files, Done, File info, and Share image
• git diff --check: passed
• personal standards/spec review: no remaining actionable findings
• Macroscope findings addressed at their owning layers: environment-safe provider fallback and nested file links in feat(swift-ios): add file preview navigation and info #6132; resolved nested-image tap URL in feat(swift-ios): show workspace images inline #6133
• direct independent reviewer: Claude Code 2.1.224 invoked claude-opus-5 at high effort, but exited 1 with the Anthropic session limit before returning a verdict; no Opus findings or approval are claimed

UI evidence

Exact-head Simulator video — Tailnet-only, H.264, 247,743 bytes, SHA-256 5d36e053e12f4559394f1095b314e1d02adb78c43a1a1c5d76506fe1a7ef20f8; full and byte-range downloads verified.

Delivery: chain
Validated against Theo commit: f98cab5
Depends on: #5803, #6132
Merge order: #5803 → #6132 → #6133
Validation status: Current head 83272ae is mergeable and every actionable current-head CI/review check is green, with no unresolved review threads. Revalidate after #5803 lands, then again after #6132 lands. The unrelated Vercel authorization failure is a maintainer-side gate.

Built with GPT-5.6 Sol in the Codex harness.

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